Water is boiling at 1 atm pressure in a stainless steel pan on an electric range. It is observedthat 2 kg of liquid water evaporates in 30 min. Find the rate of heat transfer to the water(kW).

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Chemistry for Engineering Students

4th Edition

ISBN:9781337398909

Author:Lawrence S. Brown, Tom Holme

Publisher:Lawrence S. Brown, Tom Holme

Chapter9: Energy And Chemistry

Section: Chapter Questions

Problem 9.94PAE

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In the 1880s, Frederick Trouton noted that the enthalpy of vaporization of 1 mol pure liquid is approximately 88 times the boiling point, Tb, of the liquid on the Kelvin scale. This relationship is called Troutons rule and is represented by the thermochemical equation liquid gas H = 88 Tb, joules Combined with an empirical formula from chemical analysis, Troutons rule can be used to find the molecular formula of a compound, as illustrated here. A compound that contains only carbon and hydrogen is 85.6% C and 14.4% H. Its enthalpy of vaporization is 389 J/g, and it boils at a temperature of 322 K. (a) What is the empirical formula of this compound? (b) Use Troutons rule to calculate the approximate enthalpy or vaporization or one mole of the compound. Combine the enthalpy of vaporization per mole with that same quantity per gram to obtain an approximate molar mass of the compound. (c) Use the results of parts (a) and (b) to find the molecular formula of this compound. Remember that the molecular mass must be exactly a whole-number multiple of the empirical formula mass, so considerable rounding may be needed.
A student is given a sample of a pink manganese (II) chloride hydrate. She weighs the sample in a dry, covered crucible and obtains a mass of 26.742g for the crucible, cover, and sample. Earlier she had found that the crucible and cover weighed 23.599g. She then heats the crucible to drive off the water of hydration, keeping the crucible at red heat for about 10 minutes with the cover slightly ajar. She then lets the crucible cool and finds it has a lower mass; the crucible, cover and contents then weigh 25.598g. In the process the sample was converted to off-white anhydrous MnCl2. a. What was the mass of the hydrate sample? _ghydrate b. What is the mass of the anhydrous MnCl2? _gMnCl2 c. How much water was driven off? _gH2O d. What is the percent by mass of water in the hydrate? water=massofwaterinsamplemassofhydrateinsample100 _massH2O e. How many grams of water would there be in 100.0g hydrate? How many moles? _gH2O; _molesH2O f. How many grams of MnCl2 are there in 100.0g hydrate? How many moles? What percentage of the hydrate is MnCl2? Convert the mass of MnCl2 to moles. The molar mass of MnCl2 is 125.85g/mol. _gMnCl2; _molesMnCl2 g. How many moles of water are present per mole MnCl2? _ h. What is the formula of the hydrate? _
Ff.100.
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1) a) An electric immersion heater rated at 100 W is used to heat up 10 kg of water initially at 20 Degrees Celsius. If any heat loss is ignored, how long does it take for the water to reach a temperature of 80 Degrees Celsius? b) Now you cannot wait that long to take a warm shower and your patience is only 15 minutes. So, you decide to buy a new and more powerful heater. What should be the power of the heater?
Suppose four 30-g ice cubes are added to a glass containing 200 cm3 of orange juice at 20,0°C.You may assume that the orange juice has a density and specific heat capacity the same as water namely: Density = 1,0 g∙cm–3 and specific heat = 4,184 J/gKThe heat of fusion (of water) is 333 J/g. Your task is twofold. You must determine: a) Whether or not all the ice will melt; and b) If your finding is that some ice will be left in the juice, you must calculate what mass of ice will be present the moment when thermal equilibrium is reached.
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The British thermal unit (Btu) is commonly used in engineering applications. A Btu is defined as the amount of heat required to raise the temperature of 1 lb of water by 1 °F. There are ________ Btu in one Joule. 1 lb = 453.59 g; °C = (5/9)(°F - 32°); specific heat of H2O (l) = 4.184 J/g-K.
4 Andy has a bath and uses 1500g of water heated from 10°C to 40°C and with a specific heat capacity of 4200J/kg C. How much energy does he use? S. An electric kettle supplies 20,000] of energy to heat 0.5kg of water. What is the temperature change? The specific heat capacity of water is42001/kg C. 6. A piece of lead with a specific heat capacity of 1261/kg C is given 5000] of energy to heat it from 20°C to 250"C. What was the mass of the piece of lead? 7. A2 kg metal cylinder is supplied with 1600] of energy to heat it from 5°C to 13°C. What is the specific heat capacity of the metal? 8. 201,600] is supplied to 600g of water with a specific heat capacity of 42001/kg"C. What is the change in temperature? 9. CHALLENGE! Becky has a shower and uses 20,000g of water with a specilic heat capacity of 4200/kg C. When the water is supplied with 336,000] of energy, it heats up to 50°C. What was th starting temperature of the water? 10. Explain why houses built of stone take a long time to warm…
please just answer number 38.. NUMBER 38 ONLY PLSS
1
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Water is boiling at 1 atm pressure in a stainless steel pan on an electric range. It is observed that 2 kg of liquid water evaporates in 30 min. Find the rate of heat transfer to the water (kW).